Seems to be fixed in 13.10 daily (Sun 18 Aug 2013 20:58:40 EDT)
I get about 5.6 GB/s on both cache of both encrypted and normal disks
Fresh install in VertualBox.
sudo -i
cryptsetup -c aes-xts-plain -s 512 luksFormat /dev/sdb
cryptsetup luksOpen /dev/sdb crypttest
mkfs.ext4 /dev/mapper/crypttest
mkdir /media/crypt
mount /dev/mapper/crypttest /media/crypt
dd if=/dev/urandom of=/media/crypt/test.dat bs=1M count=1024
cp /media/crypt/test.dat ~/test.dat
dd if=~/test.dat of=/dev/null bs=1M count=1024
dd if=~/test.dat of=/dev/null bs=1M count=1024
dd if=/media/crypt/test.dat of=/dev/null bs=1M count=1024
dd if=/media/crypt/test.dat of=/dev/null bs=1M count=1024
** Changed in: linux (Ubuntu)
Status: Incomplete => Fix Released
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https://bugs.launchpad.net/bugs/875733
Title:
disk cache is slow on average with dm-crypt
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